SROA: Handle a case of store size being smaller than allocation size
In this case, we are creating an x86_fp80 slice for a union from C where
the padding bytes may contain real data. An x86_fp80 alloca is 16 bytes,
and that's just fine. We can't, however, use regular loads and stores to
access the slice, because the store size is only 10 bytes / 80 bits.
Instead, use memcpy and memset.
Fixes PR18726.
Reviewed By: chandlerc
Differential Revision: http://reviews.llvm.org/D5012
llvm-svn: 216248
diff --git a/llvm/test/Transforms/SROA/slice-width.ll b/llvm/test/Transforms/SROA/slice-width.ll
index 179780b..dc56e53 100644
--- a/llvm/test/Transforms/SROA/slice-width.ll
+++ b/llvm/test/Transforms/SROA/slice-width.ll
@@ -1,7 +1,8 @@
; RUN: opt < %s -sroa -S | FileCheck %s
-target datalayout = "e-p:64:64:64-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n8:16:32:64"
+target datalayout = "e-p:64:64:64-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-f80:128-v64:64:64-v128:128:128-a0:0:64-n8:16:32:64"
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
+declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind
define void @no_split_on_non_byte_width(i32) {
; This tests that allocas are not split into slices that are not byte width multiple
@@ -23,3 +24,49 @@
%t1 = load i1* %p1
ret void
}
+
+; PR18726: Check that we use memcpy and memset to fill out padding when we have
+; a slice with a simple single type whose store size is smaller than the slice
+; size.
+
+%union.Foo = type { x86_fp80, i64, i64 }
+
+@foo_copy_source = external constant %union.Foo
+@i64_sink = global i64 0
+
+define void @memcpy_fp80_padding() {
+ %x = alloca %union.Foo
+
+ ; Copy from a global.
+ %x_i8 = bitcast %union.Foo* %x to i8*
+ call void @llvm.memcpy.p0i8.p0i8.i32(i8* %x_i8, i8* bitcast (%union.Foo* @foo_copy_source to i8*), i32 32, i32 16, i1 false)
+
+ ; Access a slice of the alloca to trigger SROA.
+ %mid_p = getelementptr %union.Foo* %x, i32 0, i32 1
+ %elt = load i64* %mid_p
+ store i64 %elt, i64* @i64_sink
+ ret void
+}
+; CHECK-LABEL: define void @memcpy_fp80_padding
+; CHECK: alloca x86_fp80
+; CHECK: call void @llvm.memcpy.p0i8.p0i8.i32
+; CHECK: load i64* getelementptr inbounds (%union.Foo* @foo_copy_source, i64 0, i32 1)
+; CHECK: load i64* getelementptr inbounds (%union.Foo* @foo_copy_source, i64 0, i32 2)
+
+define void @memset_fp80_padding() {
+ %x = alloca %union.Foo
+
+ ; Set to all ones.
+ %x_i8 = bitcast %union.Foo* %x to i8*
+ call void @llvm.memset.p0i8.i32(i8* %x_i8, i8 -1, i32 32, i32 16, i1 false)
+
+ ; Access a slice of the alloca to trigger SROA.
+ %mid_p = getelementptr %union.Foo* %x, i32 0, i32 1
+ %elt = load i64* %mid_p
+ store i64 %elt, i64* @i64_sink
+ ret void
+}
+; CHECK-LABEL: define void @memset_fp80_padding
+; CHECK: alloca x86_fp80
+; CHECK: call void @llvm.memset.p0i8.i32(i8* %{{.*}}, i8 -1, i32 16, i32 16, i1 false)
+; CHECK: store i64 -1, i64* @i64_sink